High number of chikungunya cases reported among travellers returning from Seychelles: local transmission in mainland Europe currently unlikely

The emergence of chikungunya virus disease in Seychelles aligns with a broader regional spread in the Indian Ocean Islands. There is currently increased chikungunya virus activity in the area, with cases reported from Mauritius, Comoros, and the EU outermost regions of Réunion Island and Mayotte. In 2025, both Réunion Island and Mayotte experienced major outbreaks. According to local health authorities, chikungunya virus is currently more widespread in Seychelles than other vector-borne viruses.

What this means for travellers and for Europe 

The current likelihood of chikungunya virus infection for travellers to Seychelles is high. As the peak travel period is between February and April, travellers should take enhanced mosquito bite-prevention measures while in Seychelles. Protective measures include using mosquito repellent, sleeping under a mosquito net or in a screened or air-conditioned room, and wearing clothing that covers most of the body. Vaccination may also be considered in line with recommendations in their country of origin.

At present, the likelihood of local transmission in mainland Europe following the return of a traveller who has been infected is considered unlikely, as winter environmental conditions are not favourable for the activity of Aedes mosquitoes, the species that can transmit chikungunya virus. 

Symptoms and what to do if feeling unwell

Symptoms of chikungunya may appear several days after infection, including after returning home. Common symptoms include headache, fever, nausea and vomiting, and muscle and joint pain. 

Travellers who feel unwell during travel should seek medical advice, especially if experiencing fever or joint pain. They should avoid further mosquito bites by using repellent and protective clothing, rest and stay hydrated, and avoid travelling onward while unwell, if possible.

After returning from travel, individuals should monitor their health for symptoms for up to three weeks, seek medical advice if symptoms develop and inform their healthcare provider about their recent travel.

Although chikungunya is generally not considered a fatal disease, certain factors can increase the risk of more severe illness. These include being in the last weeks of pregnancy (which may pose a risk to newborns exposed during childbirth), being over 65 years old, or having underlying health conditions. 

Public health response

ECDC is monitoring the situation and will provide regular updates through its website.